Apparatus for intercoupling well tool sections having electrical and fluid lines

ABSTRACT

In the preferred embodiment of the invention disclosed herein, a well tool comprised of one or more separable bodies carrying electrical and hydraulic devices as required for operating the tool. To control the hydraulic devices, another separable body is provided with a selectively-operable hydraulic pressure generator. The mating ends of the several bodies are tandemly intercoupled by new and improved coupling means cooperatively arranged for facilitating the quick and foolproof connection and disconnection of electrical and hydraulic lines in each body.

i OR

United States Patent [191 Planche,

[11] 3,831,443 [451 Aug. 27, 1974 APPARATUS FOR INTERCOUPLING WELL TOOL SECTIONS HAVING ELECTRICAL AND FLUID LINES Inventor: Jean Planche, LHay-Ixs-Roses,

France [73] Assignee: Schlumberger Technology Corporation, New York, NY.

Filed: Jan. 19, 1973 Appl. No.: 324,936

Foreign Application Priority Data Jan. 26, 1972 France 72.02579 US. Cl. 73/152, 137/614.05 Int. Cl EZlb 47/00 Field of Search 73/151, 152; 339/117 R,

339/117 P, 118 R, 118 RY; 137/614, 614.05

References Cited UNITED STATES PATENTS 1l/l970 Evans 137/614 Primary Examiner-Jerry W. Myracle Attorney, Agent, or Firm-Emest R. Archambeau, Jr.; William R. Sherman; Stewart F. Moore 12 Clairm, 5 Drawing Figures DIAMETER MEASUR/NG POTENT/OME TE R APPARATUS FOR INTERCOUPLING WELL TOOL SECTIONS HAVING ELECTRICAL AND FLUID LINES Many well-completion tools include laterallyextendible members which must be selectively operated either for eccentering the entire tool in a well bore or for urging a formation-measuring device against one wall of the well bore. To accomplish this, it is typical to arrange a motor-driven hydraulic pump in the tool and couple the pump by one or more fluid conduits to one or more piston actuators for controlling the movements of these extendible wall-engaging members. No particular problem is presented, of course, so long as the hydraulic system is arranged in a single tool body and does not have to be disassembled except for maintenance or occasional repairs.

It will be recognized, however, that the present trend toward more complex well-completion tools has made it necessary to arrange many of these modern tools as separable units or easily transported sections that are taken separately to a well and then coupled together to provide a unitary assembly. Although there are many suitable arrangements for making electrical interconnections betweenthe several bodies comprising one of these tools, no fully-satisfactory arrangement has been provided heretofore for efficiently interconnecting various hydraulic systems which might be arranged in two or more sections of the tool. In such-situations, it has been typical to usually provide a wholly-separate hydraulic system in each separable body of the tool carrying a hydraulically-actuated device so as to avoid the many disadvantages that would arise if conventional tubing lines and connectors were used. With a tool of significant length and having two or more widelyseparated hydraulic devices, individual self-contained hydraulic systems in each tool section will, of course, make the tool more expensive as well as needlessly add additional weight and overall length to the tool;

Accordingly, it is an object of the present invention to provide new and improved well bore apparatus having one or more separable body sections carrying hydraulically-actuated devices and which are to be tandemly coupled to another body section carrying a hydraulic pressure generator.

This and other objects of the present invention are attained by arranging the body of a well tool into two or more separable sections and mounting selectivelycontrolled hydraulic pressuregenerating means in a first one of these sections and one or more hydraulically-actuated devices in at least a second one of the other separable sections. The mating ends of the first and second sections and other body sections which are to be coupled therebetween are respectively provided with new and improved selectively-releasable coupling meansfor intercoupling one or more fluid-filled hydraulic lines to provide fluid communication between the pressure-generating means and the pressureactuated devices as well as for interconnecting one or more electrical conductors to electrically interconnect the several body sections. To enable fluid to be re tained in those portions of the hydraulic system arranged in each body section, the coupling means for each mating end further include valve means cooperatively arranged to close upon separation of the body sections for trapping hydraulic fluid in each portion of the system and to open upon connection of the body sections for intercommunicating the several portions of the hydraulic system once the body of the well tool is assembled.

The novel features of the present invention are set forth with particularity in the appended claims. The invention, together with further objects and advantages thereof, may be best understood by way of the following description of exemplary apparatus employing the principles of the invention as illustrated in the accompanying drawings, in which:

FIG. 1 shows a typical well tool comprised of a plurality of separable body sections which are joined together by a preferred embodiment of new and improved coupling means incorporating the principles of the present invention;

FIGS. 2A and 2B are successive cross-sectional views somewhat-schematically depicting two of the body sections illustrated in FIG. 1; and

FIGS. 3 and 4 are enlarged views of a preferred embodiment of the present invention illustrating the operation of the new and improved coupling means as two mating ends of two body sections are coupled to one another.

Turning now to FIG. 1, a well tool 10 is shown suspended in a well bore, such as a borehole 11, from a typical multiconductor logging cable 12 which is spooled in the usual manner on a winch (not shown) at the earths surface and connected to typical surface equipment (not shown) adapted for supplying power to the tool and recording various measurements from the tool. It will, of course, be recognized that the present invention has utility with any multi-sectional wellcompletion tool having electrical and hydraulic lines which must be interconnected when the tool is assembled. However, to demonstrate an exemplary application of the principles of the present invention, the well tool 10 is preferably a logging tool such as that shown in a copending application Ser. No. 256,075 filed in the United States Patent Office on May 23, 1972.

As seen in FIG. 1, the logging tool 10 is comprised of an upper body section 13 and a plurality of tandemlyarranged separable body sections 14-18 which are respectively joined at their mating ends by new and improved coupling means, as at 19, incorporating the principles of the present invention. A typical end cap 20 is provided for closing the lower end of the lowermost body 18. Although other arrangements might be employed for different tools with different requirements, in the tool 10 illustrated in FIG. 1, the body sections 13 and 16 are employed for housing various electrical components as typically required for operation of the tool and obtaining the desired fonnation measurements.

As one illustration of formation measurements which might be provided by the logging tool 10, a typical acoustic transducer 21 is mounted in the upper end of the body 17 and cooperatively arranged for directing acoustic energy outwardly into the earth formations surrounding the borehole 11. To receive the directed acoustic energy, a pair of typical acoustic transducers 22 and 23 are mounted at spaced intervals on an extendible wall-engaging pad member 24 having its upper end pivotally coupled, as by a link or arm 25, to the body 17. It will, of course, be appreciated that the transducers 21-23 could also respectively be a radioactive source and a pair of gamma-ray detectors.

To selectively extend the transducer pad 24 in relation to the forward side of the tool 10, means, such as an arcuate spring 26 cooperatively coupled to the body 17 and the mid-portion of the pad member, are provided for normally urging the forward face of the pad outwardly into contact with the wall of the borehole 11. As will be subsequently explained in greater detail, a piston actuator 27 is cooperatively arranged on the body 17 and coupled to one end of a crank arm 28 which is pivotally mounted in an upright position on the body 17 and has its other end pivotally coupled to the mid-portion of the pad 24. In this manner, when hydraulic pressure is applied to the piston actuator 27, the pad 24 is moved laterally inwardly against the outwardly-applied force of the spring 26 to retract the pad against the forward side of the tool 10.

Since the pad 24 must be maintained in sliding contact with one wall of the borehole 11, it is preferred to shift the entire tool toward that wall of the borehole to minimize the distance which the pad 24 must move when it is extended. On the other hand, it is preferred that the forward face of the tool 10 remain spatially disposed from the wall of the borehole 11 a sufficient distance to allow the transducer pad 24 to pivot about the outer end of the crank arm 28 as may be required for the pad to maintain contact with an irregular borehole surface as the logging tool is moved up the borehole.

Accordingly, to maintain the tool 10 in a suitable eccentered relationship in the borehole 11, selectivelyoperable eccentering means 29 and 30 are arranged in the bodies and 18 for cooperatively positioning the upper and lower ends of the tool as required for a given situation. As will subsequently be explained in greater detail by reference to FIG. 2B, the tool-eccentering means 29 and 30 respectively include selectivelyextendible elongated arms 31 and 32 which are normally urged outwardly by arcuate springs 33 and 34 from the rear side of the tool 10 so as to maintain the outer ends of these arms in sliding contact with the wall of the borehole 11 diametrically opposite from the borehole wall being contacted by the transducer pad 24. The tool-eccentering means 29 and 30 also respectively include selectively-extendible wheels or rollers 35 and 35 which are journalled in upright positions on the outer ends of pivotally-mounted crank arms 37 and 38 and normally maintained in rolling engagement with the wall of the borehole 11 above and below the pad 24 so as to allow the pad sufficient clearance to tilt as required to maintain contact with the borehole wall. Piston actuators 39 and 40 are respectively mounted in the tool body sections 15 and 18 and cooperatively coupled to the arms 31 and 32 and the cranks 37 and 38 for selectively retracting these members in a manner which will subsequently be described.

To control the several piston actuators 27, 39 and 40, selectively-operable hydraulic pressure-generating means 41 are arranged in the tool section 14 and cooperatively arranged to supply a pressured hydraulic fluid to the several piston actuators. As will subsequently be explained in greater detail by reference to FIG. 2A, in the preferred embodiment of the logging tool 10 the pressure-generating means 41 include a suitable hydraulic pump 42 which is driven by an electrical motor 43 and coupled by a fluid conduit 44 to the several piston actuators 27, 39 and 40.

Turning now to FIGS. 2A and 2B, enlarged, somewhat-schematic views are shown of preferred embodiments of the upper eccentering means 29 in the body 15 and the pressure-generating means 41 in the body 14 as well as a preferred embodiment of one of the new and improved coupling means 19 of the present invention. In the preferred embodiment of the pressuregenerating means 41 as shown in FIG. 2A, the body 14 is provided with upper and lower end walls or bulkheads 45 and 46 to enclose the interior of the body section. The interior of the body 14 is further divided by spaced partitions or transverse walls 47 and 48 which are joined by an axially aligned tubular member 49 for defining an annular piston chamber 50 around the tubular member between these transverse partitions and providing an isolated conduit for a multi-conductor cable 51 extending between typical electrical feedthrough or bulkhead connectors 52 and 53 respectively mounted in the upper and lower end walls 45 and 46 for mating connection with similarly-arranged connectors in adjacent tool bodies as at 13 and 15.

The pump 42 and the motor 43 are conveniently arranged in the interior space 54 defined within the body 15 between the walls 46 and 48 and this enclosed space is filled with a suitable hydraulic fluid for supplying the pump. Inasmuch as the logging tool 10 must operate at extreme depths in well bores typically containing dirty well bore fluids, the oil-filled reservoir 54 of the pressure-generating means 41 is communicated by way of the cable conduit 49 and a lateral port 55 therein to the oil-filled lower portion of the piston chamber 50. To maintain the oil in the piston chamber 50 and the reservoir 54 at a pressure at least equal to the hydrostatic pressure of fluids in the borehole 11, an annular piston 56 is sealingly disposed within the chamber for movement between an outstanding shoulder 57 on the cable conduit 49 above the port 55 and a lateral port 58 in the sidewall of the body 14 communicating the space above the piston with the borehole fluids.

Since the tool 10 may often be operated in hightemperature well bores the pressure-generating means 41 are further arranged with the lower portion of the chamber 50 defining a compensation chamber 59 and the two chambers are isolated from one another by a second annular piston 60 which is normally urged downwardly by one or more stout springs 61 mounted around the cable conduit 49 between the piston and the shoulder 57. A conduit 62 is coupled between the output of the pump 42 and the oil-filled compensation chamber 59. Accordingly, as oil in the output hydraulic conduit 44 expands and contracts in response to changes in borehole temperatures, the compensating piston 60 will move as required to vary the volume in the compensation chamber 59. It will be appreciated, of course, that since the oil in the piston chamber 50 above the compensating piston 60 is maintained at bydrostatic pressure, the oil in the compensation chamber 59 will also remain at least at hydrostatic pressure. Moreover, by sizing the springs 61 in accordance with the expected output pressure of the pump 42, the compensating piston 60 will primarily move only as required to accommodate volumetric changes in the oil which may be caused by temperature variations.

To eliminate the need for providing an oil-return conduit back to the oil reservoir 54, it is preferred to arrange a bypass valve, such as a normally-closed solenoid-actuated valve 63, for selectively returning oil directly to the reservoir from that portion of the hydraulic output conduit 44 within the body 14. Thus, when the pump 42 is to be operated to develop an increased hydraulic pressure above the hydrostatic pressure of the well bore fluids, the bypass valve 63 will be left closed. On the other hand, by simply actuating the solenoid valve 63, the pressure of oil in the hydraulic output conduit 44 will be reduced to the pressure level of the oil in the reservoir 54. As is typical, a check valve 64 and a pressure-relief valve 65 are arranged in that portion of the output conduit 44 within the body 14.

As seen in FIG. 2B, in preferred embodiment of the upper eccentering means 29 (as well as the lower eccentering means 30), the body is arranged as a longitudinally-spaced pair of upper and lower cylindrical enclosures 66 and 67 which are joined by a pair of upright elongated members 68 and 69 separated as required to accommodate the movements of the eccentering arm 31 and the wall-engaging roller 35. The upper and lower enclosure members 66 and 67 are fluidly coupled by an axially-disposed tubular member 70 so that all three members comprise an extension of that portion of the hydraulic output conduit 44 extending through the body 15 between the upper and lower end walls 71 and 72 of the body. In a fashion similar to the previously-described arrangement of the body 14, the tubular member 70 further serves as a conduit for carrying a multi-conductor cable 73 which is connected between typical electrical connectors 74 and 75 respectively mounted in the upper and lower end walls 71 and 72.

In the preferred arrangement of the eccentering means 29 (as well as the piston actuator 39 is arranged in the form of a single piston cylinder 76 which is mounted in an upright position between the side members 68 and 69 and carries a pair of opposed pistons 77 and 78. As illustrated, a branch conduit 79 couples the oil-filled tubular member 70 to the space in the cylinder 76 between the two opposed pistons 77 and 78 so that, upon an increase of hydraulic pressure in the hydraulic output conduit 44, the pistons will move apart. Thus, by arranging the upper eccentering arm 31 to extend beyond its pivot 80 in the form of an offset crank arm 81 which is engaged by the upper end of the piston 77 as it moves upwardly in relation to the cylinder 76, the eccentering arm will be retracted against the opposing outward force supplied by the curved spring 33.

Similarly, the roller is retracted upon an increase of hydraulic pressure in the cylinder 76, by cooperatively coupling the lower opposed piston 78 to the crank 37. It should be noted at this point that it is preferred that the roller 35 (as well as the lower roller 36) remains fully extended even though the eccentering arm 31 must partially retract to accommodate the passage of the logging tool 10 through a reduced-diameter well bore. To accomplish this, a stout spring 82 is arranged in the piston cylinder 76 for normally urging the piston 78 upwardly. Thus, by properly sizing the strength of the spring 82 in relation to that of the curved arm spring 33 and taking into account the effective outward forces respectively imposed by these springs on the roller 35 and the eccentering arm 31, the eccentering arm is allowed to retract before the roller moves toward its retracted position. It should be noted that the details of this arrangement are more fully described in a copending application, Ser. No. 256,107,

filed in the United States Patent Office on May 23, 1972.

As illustrated in FIGS. 2A and 2B, the bodies 14 and 15 are tandemly coupled by the new and improved coupling means 19 of the present invention. In the preferred embodiment of the present invention, the adjoining ends of the body sections 14 and 15 are cooperatively arranged so that the lower end of the body 14 is, for example, counterbored, as at 83, and adapted to receive the reduced-diameter upper end portion 84 of the body 15. An externally-threaded collar 85 is rotatably mounted between a shoulder 86 and a split-ring 87 spaced on the upper end portion 84 of the body 15 and adapted for threading reception within complementary threads 88 formed around the counterbore 83 in the lower end of the body 14 to mechanically secure the two bodies in a tandem relationship. Appropriate seals, as at 89, fluidly seal the sections 14 and 15 in relation to one another.

It will be recognized, of course, that by arranging the electrical connectors 53 for mating engagement with the connectors 74 when the body sections 14 and 15 are coupled together, the electrical cables 51 and 73 will be appropriately interconnected as required to connect the electrical circuitry in the upper body 13 to the several electrical devices in the other bodies 14-18.

Of particular interest for the achievement of the objects of the present invention, it will be noted in FIGS. 2A and 2B that by fluidly coupling the tubular member 70 and the two'enclosures 66 and 67 in the body 15 to the tubular conduit in the reservoir 54, the hydraulic output conduit44 will be extended from the body 14 and through the body 15 to its lower end for similar extension to the other bodies 16-18. Accordingly, to effect this fluid coupling of the two bodies, the upper end wall 71 of the body 15 is, for example, axially counterbored, as at 90, for receiving a complementally-shaped axially-disposed tubular projection 91 depending from the lower end wall 46 of the body 14. Appropriatelyarranged fluid seals, as at 92, are provided for sealing the mating elements in relation to one another.

It will be recognized, of course, that unless provisions are made, uncoupling of the body 15 from the body 14 will result in the oil in the hydraulic output conduit 44 draining out. Accordingly, as best illustrated in FIGS. 3 and 4, normally-closed valve means, as at 93 and 94, are respectively mounted in the depending probe 46 and its mating counterbore and cooperatively arranged for opening in response to intercoupling of the two bodies 14 and 15. In the preferred embodiment of the present invention depicted in FIGS. 3 and 4, the valve means 93 are comprised of a ball valve member 95 which is mounted within the tubular probe 91 and normally urged downwardly by means, such as a spring 96, into seating engagement with an annular valve seat 97 formed within the lower portion of the probe member. Similarly, the valve means 94 include a ball valve member 98 arranged within the counterbore 90 and biased upwardly by a spring 99 into normal seating engagement with an annular valve seat 100 formed around the upper end of the counterbore 90. Thus, so long as the ball valves 95 and 98 are respectively seated (as when the bodies 14 and 15 are uncoupled), oil cannot drain from those portions of the hydraulic conduit 44 respectively in the two bodies.

To automatically unseat the ball valves 95 and 98 as the two bodies 14 and 15 are coupled together, the new and improved coupling means 19 further include valveactuating means 101 cooperatively arranged to leave the valve members seated until the bodies approach their respective fully-coupled positions. In the preferred embodiment of the coupling means 19, the valve-actuating means 101 include a depending thrust rod 102 which is substantially smaller than the internal bore 103 of the probe member 91 and is coaxially secured therein, as by a spider 104, so as to not materially block fluid communication through the probe. As will be recognized by comparing FIGS. 3 and 4, the fixed thrust rod 102 is sized so as to pass through the valve seat 100 and contact the upper end of the ball member 98 to progressively unseat it as the coupling ring 85 draws the bodies 14 and 15 into their final fullycoupled positions.

The ball valve 95 is similarly unseated as the bodies 14 and 15 are moved to their fully-coupled positions. To achieve this, the valve-actuating means 101 further include a movable thrust rod 105 which is slidably mounted within the spider 104 and projected upwardly in coincidental alignment with the valve seat 97. The overall length of the movable thrust rod 105 is selectively arranged so that as the bodies 14 and 15 are brought together by the coupling ring 85, the lower end of the thrust rod will be contacted by an upwardlyfacing shoulder 106 in the counterbore 90 above the valve seat 100. As the thrust rod 105 is shifted upwardly, its upper reduced-diameter end will pass through the valve seat 97 and contact the valve member 95 to unseat it by the time the bodies 14 and 15 are fully coupled.

Uncoupling of the bodies 14 and 15 will, of course, allow the spring 96 to reseat the ball 95 as the thrust rod 105 is moved back downwardly through the valve seat 97 as the shoulder 106 is moved away from the probe 91. Similarly, as the bodies 14 and 15 are moved apart, the fixed thrust rod 102 will be withdrawn from within the valve seat 100 to allow the spring 99 to reseat the ball 99 by the time the bodies are uncoupled.

It will, of course, be recognized that by arranging similar coupling means, as at 19, for the several bodies 14-18, once the bodies are tandemly coupled, the hydraulic conduit 44 will be extended through each of the bodies in a leak-proof manner. Moreover, when the bodies l4-l8 are uncoupled, the new and improved cou pling means 19 will be effective for tightly sealing the oil in each body so that the tool can be rapidly assembled without refilling of the oil supply used for actuating the several hydraulic devices thereof.

While only a particular embodiment of the present invention has been shown and described, it is apparent that changes and modifications may be made without departing from this invention in its broader aspects; and, therefore, the aim in the appended claims is to cover all such changes and modifications as fall within the true spirit and scope of this invention.

What is claimed is:

1. Well bore apparatus adapted for suspension in a well bore from an electrical cable and comprising:

a well tool sized for passage through a well bore and including first and second separable body sections having their adjacent end portions respectively adapted for mating engagement;

pressure-generating hydraulic means on said first tool body and including a pump having a fluid outlet, a first fluid conduit coupled to said pump outlet, and motor means coupled to said pump;

pressure-responsive hydraulic means on said second tool body and including pressureactuated means, and a second fluid conduit coupled to said pressure-actuated means for supplying hydraulic fluid thereto; and

means adapted for intercoupling said tool bodies and said hydraulic means and including end-coupling means on said first and second end portions cooperatively arranged for releasably securing said end portions to one another to tandemly couple said tool bodies together, first and second mating conduit terminals respectively fluidly coupled to said first and second conduits mounted in coincidental alignment with one another on said first and second end portions and cooperatively arranged for mating engagement with one another when said end portions are secured together, first and second valve means respectively mounted in said first and second mating conduit terminals and cooperatively arranged for movement between open and closed positions to control fluid communication therethrough, and valve-actuating means cooperatively arranged in at least one of said mating conduit terminals for moving said first and second valve means to their respective open positions when said end portions are secured together and for moving said first and second valve means to their respective closed positions when said end portions are released from one another.

2. The well bore apparatus of claim 1 further including:

first electrical conductor means on said first tool body connected to said motor means and adapted for connection to an electrical cable supporting said well tool;

electrically-actuated means on said second tool body;

second electrical conductor means on said second tool body and connected to said electricallyactuated means; and

first and second mating electrical connector means respectively connected to said first and second electrical conductor means mounted in coincidental alignment with one another on said first and second end portions and cooperatively arranged for mating engagement with one another when said end portions are secured together.

3. The well bore apparatus of claim 1 wherein said first and second mating conduit terminals are respectively mounted in coaxial alingment with the longitudinal axes of said first and second tool bodies.

4. The well bore apparatus of claim 3 further including:

first electrical conductor means on said first tool body connected to said motor means and adapted for connection to an electrical cable supporting said well tool;

electrically-actuated means on said second tool body;

second electrical conductor means on said second tool body and connected to said electricallyactuated means; and

first and second mating electrical connector means respectively connected to said first and second electrical conductor means mounted in coincidental alignment with one another on said first and second end portions in a symmetrical pattern around said first and second mating conduit terminals and cooperatively arranged for mating engagement with one another when said end portions are secured together.

5. Well bore apparatus adapted for suspension in a well bore from an electrical cable and comprising:

' a well tool sized for passage through a well bore and including first and second separable body sections having adjacent end portions respectively adapted for mating engagement;

first pressure-responsive hydraulic means on said first tool body and including first pressure-actuated means, and a first fluid conduit coupled to said firstpressure-actuated means for supplying hydraulic fluid thereto; second pressure-responsive hydraulic means on said second tool body and including second pressureactuated means, and a second fluid conduit coupled to said second pressure-actuated means for supplying hydraulic fluid thereto; and means adapted for intercoupling said tool bodies and said hydraulic means and including end-coupling means on said first and second end portions cooperatively arranged for releasably securing said end portions to one another to tandemly couple said tool bodies together, first and second mating conduit terminals respectively fluidly coupled to said first and second conduits mounted in coincidental alignment with one another on said first and second end portions and cooperatively arranged for mat ing engagement with one another when said end portions are secured together, first and second valve means respectively mounted in said first and second mating conduit terminals and cooperatively arranged for movement between open and closed positions to control fluid communication therethrough, and valve-actuating means cooperatively arranged in at least one of said mating conduit terminals for moving said first and second valve means to their respective open positions when said end portions are secured, together and for moving said first and second valve means to their respective closed positions when said end portions are released from one another. 6. The well bore apparatus of claim further includfirst electrically-actuated means on said first tool y; a first electrical conductor means on said first tool body connected to said first electrically-actuated means and adapted for connection to an electrical cable supporting said well tool;

second electrically-actuated means on said second tool body;

second electrical conductor means on said second too] body connected to said second electricallyactuated means; and

first and second mating electrical connector means respectively connected to said first and second electrical conductor means mounted in coincidental alignment with one another on said first and second end portions and cooperatively arranged for 10 mating engagement with one another when said end portions are secured together. 7. The well bore apparatus of claim 5 wherein said first and second mating conduit terminals are respec- 5 tively mounted in coaxial alignment with the longitudina] axes of said first and second bodies.

8. The well bore apparatus of claim 7 further including:

first electrically-actuated means on said first tool first electrical conductor means on said first tool body connected to said first electrically-actuated means and adapted for connection to an electrical cable supporting said well tool;

second electrically-actuated means on said second tool body;

second electrical conductor means on said second tool body connected to said second electricallyactuated means; and i first and second mating electrical connector means respectively connected to said first and second electrical conductor means mounted in coincidental alignment with one another on said first and second end portions in a symmetrical pattern around said first and second mating conduit terminals and cooperatively arranged for mating engagement with one another when said end portions are secured together.

9. Well bore apparatus adapted for suspension in a well bore from an electrical cable and comprising:

a well too] sized for passage through a well bore and including first and second separable body sections having adjacent cylindrical end portions complementally sized and shaped for telescopic engagement with one another;

pressure-generating hydraulic means on said first tool body and including an enclosed fluid reservoir, a pump having a fluid intake coupled to said fluid reservoir and a fluid outlet, motor means coupled to said pump and adapted for driving said pump, a first fluid conduit coupled to said pump outlet, and a first tubular conduit terminal coupled to said first fluid conduit and coaxially mounted on said end portion of said first tool body;

pressure-responsive hydraulic means on said second tool body and including a wall-engaging member cooperatively mounted on said second tool body for movement between extended and retracted positions in relation thereto, pressure-actuated piston means cooperatively associated with said wallengaging member for selectively moving said wallengaging member at least from one of its said posi tions to the other of its said positions, a second fluid conduit coupled to said piston means, and a second tubular conduit terminal complementally sized and shaped for telescopic engagement with said first conduit terminal coupled to said second fluid conduit and coaxially mounted on said end portion of said second tool body for mating engagement with said first conduit terminal;

end-coupling means on said first and second end portions cooperatively arranged for releasably securing said end portions to one another to tandemly couple said tool bodies together; and

means adapted for selectively controlling fluid communication between said fluid conduits and including first and second valve means respectively mounted in said first and second conduit terminals and cooperatively arranged for movement between open and closed positions to control fluid communication therethrough, and valve-actuating means cooperatively arranged in at least one of said mating conduit terminals for moving said first and second valve means to their respective open positions when said end portions are secured together and for moving said first and second valve means to their respective closed positions when said end portions are released from one another.

10. The well bore apparatus of claim 9 further includfirst electrical conductor means on said first tool body connected to said motor means and adapted for connection to an electrical cable supporting said well tool;

electrically-actuated means on said second tool body;

second electrical conductor means on said second tool body and connected to said electricallyactuated means; and

first and second mating electrical connector means respectively connected to said first and second electrical conductor means mounted in coincidental alignment with one another on said first and second end portions in a symmetrical pattern around said first and second mating conduit terminals and cooperatively arranged for mating engagement with one another when said end portions are secured together.

11. The well bore apparatus of claim 9 wherein said first and second valve means include:

first and second annular valve seats respectively arranged around the internal bores of said first and second conduit terminals, first and second valve valve-actuating means include:

a first actuating member coaxially mounted within the internal bore of one of said conduit terminals and projecting outwardly therefrom for insertion through the other of said conduit terminals to engage the other valve member in said other conduit terminal and unseat said other valve member as said end-coupling means couple said end portions together; and

a second actuating member movably mounted within the internal bore of said one conduit member and having a first portion extending alongside said first actuating member and projecting outwardly from said one conduit terminal for engagement with said other conduit terminal to shift said second actuating member toward the one valve seat and valve member in said one conduit terminal as said end portions are moved toward one another, said second actuating member having a second portion coaxially disposed in the internal bore of said one conduit terminal and adapted for insertion through said one valve seat to engage said one valve member therein and unseat said one valve member as said end-coupling means couple said end portions 

1. Well bore apparatus adapted for suspension in a well bore from an electrical cable and comprising: a well tool sized for passage through a well bore and including first and second separable body sections having their adjacent end portions respectively adapted for mating engagement; pressure-generating hydraulic means on said first tool body and including a pump having a fluid outlet, a first fluid conduit coupled to said pump outlet, and motor means coupled to said pump; pressure-responsive hydraulic means on said second tool body and including pressure-actuated means, and a second fluid conduit coupled to said pressure-actuated means for supplying hydraulic fluid thereto; and means adapted for intercoupling said tool bodies and said hydraulic means and including end-coupling means on said first and second end portions cooperatively arranged for releasably securing said end portions to one another to tandemly couple said tool bodies together, first and second mating conduit terminals respectively fluidly coupled to said first and second conduits mounted in coincidental alignment with one another on said first and second end portions and cooperatively arranged for mating engagement with one another when said end portions are secured together, first and second valve means respectively mounted in said first and second mating conduit terminals and cooperatively arranged for movement between open and closed positions to control fluid communication therethrough, and valve-actuating means cooperatively arranged in at least one of said mating conduit terminals for moving said first and second valve means to their respective open positions when said end portions are secured together and for moving said first and second valve means to their respective closed positions when said end portions are released from one another.
 2. The well bore apparatus of claim 1 further including: first electrical conductor means on said first tool body connected to said motor means and adapted for connection to an electrical cable supporting said well tool; electrically-actuated means on said second tool body; second electrical conductor means on said second tool body and connected to said electrically-actuated means; and first and second mating electrical connector means respectively connected to said first and second electrical conductor means mounted in coincidental alignment with one another on said first and second end portions and cooperatively arranged for mating engagement with one another when said end portions are secured together.
 3. The well bore apparatus of claim 1 wherein said first and second mating conduit terminals are respectively mounted in coaxial alingment with the longitudinal axes of said first and second tool bodies.
 4. The well bore apparatus of claim 3 further including: first electrical conductor means on said first tool body connected to said motor means and adapted for connection to an electrical cable supporting said well tool; electrically-actuated means on said second tool body; second electrical conductor means on said second tool body and connected to said electrically-actuated means; and first and second mating electrical connector means respectively connected to said first and second electrical conductor means mounted in coincidental alignment with one another on said first and second end portions in a symmetrical pattern around said first and second mating conduit terminals and cooperatively arranged for mating engagement with one another when said end portions are secured together.
 5. Well bore apparatus adapted for suspension in a well bore from an electrical cable and comprising: a well tool sized for passage through a well bore and including first and second separable body sections having adjacent end portions respectively adapted for mating engagement; first pressure-responsive hydraulic means on said first tool body and including first pressure-actuated means, and a first fluid conduit coupled to said first pressure-actuated means for supplying hydraulic fluid thereto; second pressure-responsive hydraulic means on said second tool body and including second pressure-actuated means, and a second fluid conduit coupled to said second pressure-actuated means for supplying hydraulic fluid thereto; and means adapted for intercoupling said tool bodies and said hydraulic means and including end-coupling means on said first and second end portions cooperatively arranged for releasably securing said end portions to one another to tandemly couple said tool bodies together, first and second mating conduit terminals respectively fluidly coupled to said first and second conduits mounted in coincidental alignment with one another on said first and second end portions and cooperatively arranged for mating engagement with one another when said end portions are secured together, first and second valve means respectively mounted in said first and second mating conduit terminals and cooperatively arranged for movement between open and closed positions to control fluid communication therethrough, and valve-actuating means cooperatively arranged in at least one of said mating conduit terminals for moving said first and second valve means to their respective open positions when said end portions are secured together and for moving said first and second valve means to their respective closed positions when said end portions are released from one another.
 6. The well bore apparatus of claim 5 further including: first electrically-actuated means on said first tool body; first electrical conductor means on said first tool body connected to said first electrically-actuated means and adapted for connection to an electrical cable supporting said well tool; second electrically-actuated means on said second tool body; second electrical conductor means on said second tool body connected to said second electrically-actuated means; and first and second mating electrical connector means respectively connected to said first and second electrical conductor means mounted in coincidental alignment with one another on said first and second end portions and cooperatively arranged for mating engagement with one another when said end portions are secured together.
 7. The well bore apparatus of claim 5 wherein said first and second mating conduit terminals are respectively mounted in coaxial alignment with the longitudinal axes of said first and second bodies.
 8. The well bore apparatus of claim 7 further including: first electrically-actuated means on said first tool body; first electrical conductor means on said first tool body connected to said first electrically-actuated means and adapted for connection to an electrical cable supporting said well tool; second electrically-actuated means on said second tool body; second electrical conductor means on said second tool body connected to said second electrically-actuated means; and first and second mating electrical connector means respectively connected to said first and second electrical conductor means mounted in coincidental alignment with one another on said first and second end portions in a symmetricaL pattern around said first and second mating conduit terminals and cooperatively arranged for mating engagement with one another when said end portions are secured together.
 9. Well bore apparatus adapted for suspension in a well bore from an electrical cable and comprising: a well tool sized for passage through a well bore and including first and second separable body sections having adjacent cylindrical end portions complementally sized and shaped for telescopic engagement with one another; pressure-generating hydraulic means on said first tool body and including an enclosed fluid reservoir, a pump having a fluid intake coupled to said fluid reservoir and a fluid outlet, motor means coupled to said pump and adapted for driving said pump, a first fluid conduit coupled to said pump outlet, and a first tubular conduit terminal coupled to said first fluid conduit and coaxially mounted on said end portion of said first tool body; pressure-responsive hydraulic means on said second tool body and including a wall-engaging member cooperatively mounted on said second tool body for movement between extended and retracted positions in relation thereto, pressure-actuated piston means cooperatively associated with said wall-engaging member for selectively moving said wall-engaging member at least from one of its said positions to the other of its said positions, a second fluid conduit coupled to said piston means, and a second tubular conduit terminal complementally sized and shaped for telescopic engagement with said first conduit terminal coupled to said second fluid conduit and coaxially mounted on said end portion of said second tool body for mating engagement with said first conduit terminal; end-coupling means on said first and second end portions cooperatively arranged for releasably securing said end portions to one another to tandemly couple said tool bodies together; and means adapted for selectively controlling fluid communication between said fluid conduits and including first and second valve means respectively mounted in said first and second conduit terminals and cooperatively arranged for movement between open and closed positions to control fluid communication therethrough, and valve-actuating means cooperatively arranged in at least one of said mating conduit terminals for moving said first and second valve means to their respective open positions when said end portions are secured together and for moving said first and second valve means to their respective closed positions when said end portions are released from one another.
 10. The well bore apparatus of claim 9 further including: first electrical conductor means on said first tool body connected to said motor means and adapted for connection to an electrical cable supporting said well tool; electrically-actuated means on said second tool body; second electrical conductor means on said second tool body and connected to said electrically-actuated means; and first and second mating electrical connector means respectively connected to said first and second electrical conductor means mounted in coincidental alignment with one another on said first and second end portions in a symmetrical pattern around said first and second mating conduit terminals and cooperatively arranged for mating engagement with one another when said end portions are secured together.
 11. The well bore apparatus of claim 9 wherein said first and second valve means include: first and second annular valve seats respectively arranged around the internal bores of said first and second conduit terminals, first and second valve members respectively arranged in said first and second conduit terminals for independently moving between fluid-blocking positions on said valve seats and fluid-communicating positions away from said valve seats, and first and second biasing means respectively arranged in said first and second conduit terminals for normally urging said first and second valve members resPectively toward their said fluid-blocking positions.
 12. The well bore apparatus of claim 11 wherein said valve-actuating means include: a first actuating member coaxially mounted within the internal bore of one of said conduit terminals and projecting outwardly therefrom for insertion through the other of said conduit terminals to engage the other valve member in said other conduit terminal and unseat said other valve member as said end-coupling means couple said end portions together; and a second actuating member movably mounted within the internal bore of said one conduit member and having a first portion extending alongside said first actuating member and projecting outwardly from said one conduit terminal for engagement with said other conduit terminal to shift said second actuating member toward the one valve seat and valve member in said one conduit terminal as said end portions are moved toward one another, said second actuating member having a second portion coaxially disposed in the internal bore of said one conduit terminal and adapted for insertion through said one valve seat to engage said one valve member therein and unseat said one valve member as said end-coupling means couple said end portions together. 